docs: def export(self, nidm_version, export_dir):
          """
          Create prov entities and activities.
          """
  
          # In FSL we have a single thresholding (extent, height) applied to all
          # contrasts
          # FIXME: Deal with two-tailed inference?
          atts = (
              (PROV['type'], self.type),
              (PROV['label'], self.label),
              (NIDM_HAS_ALTERNATIVE_HYPOTHESIS, self.tail))
  
          if self.partial_degree is not None:
              atts += (
                  (SPM_PARTIAL_CONJUNCTION_DEGREE, self.partial_degree),)
  
          self.add_attributes(atts)